On 10/29/2011 04:15 PM, Burnie West wrote:
On 10/29/2011 10:54 AM, Frank Gore wrote:
On Sat, Oct 29, 2011 at 1:47 PM, Johan Vromans<jvrom...@squirrel.nl> wrote:
But what would be required to process the 'raw' (multi-dimensional) data
from an LFE camera? Each pixel or group of pixels gets a Z-component
that makes the object that this group represents in focus in a
particular plane only.
It currently requires custom proprietary software from the
manufacturer, no other software can decode those images yet. As for
the mechanics of how it could be done and how to add support for it,
that would be best discussed on the dev mailing list. However, since
there are currently no publicly available output files from those
cameras, the point is moot.
--
Frank Gore
www.ProjectPontiac.com
_______________________________________________
gimp-user-list mailing list
gimp-user-list@gnome.org
http://mail.gnome.org/mailman/listinfo/gimp-user-list
It appears (from the underlying thesis) that an array of individual images
with different
focuses are captured. The thesis itself indicates 30 images located in a
square array,
with the target image captured in each element. Since the images are
distributed across
the entire photosensitive array, a fair amount of chromatic dispersion can be
detected.
For any image, therefore, 30 times as many pixels (more or less, depending on
the
subsequent manufacturing details) must be captured. The underlying software
has an
apparently complex but straightforward sorting problem, allowing to choose
whichever
pixel is at the best focus for the selected image point in the composite.
It appears at first glance that the images in the light field camera picture
gallery have
at least four focal planes available
(https://www.lytro.com/living-pictures/282).
From the image editing standpoint (if this is the case), it would not be
sharply different
from the refocusing opportunity by providing four successive shots with
different focal
length. Of course, the chromatic aberration correction would not be available
this way,
nor would moving image capture be handled.
So the thirty images would necessarily have to be divided into the appropriate
planes,
presumably using radial symmetry for the chromatic correction.
Seems to me the light field camera is a pretty good idea, and as it evolves
over time I
suspect it will be quite interesting.
The thesis itself is available from the lytro.com website -
lytro.com/renng-thesis.pdf
-- Burnie
_______________________________________________
gimp-user-list mailing list
gimp-user-list@gnome.org
http://mail.gnome.org/mailman/listinfo/gimp-user-list
An article in the December Atlantic magazine ("Deep Focus" by Rob Walker)
suggests that the released Lytro cameras are more complex than the
aforementioned thesis describes. According to Rob, Ren Ng's Lytro camera has
"integrated hundreds of microlenses into a single device." Certainly
interesting; hardly a simple direction for GIMP to pursue.
-- Burnie
_______________________________________________
gimp-user-list mailing list
gimp-user-list@gnome.org
http://mail.gnome.org/mailman/listinfo/gimp-user-list